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Ejaculatory duct obstruction (EDO) is a congenital or acquired pathological condition which is characterized by the obstruction of one or both ejaculatory ducts. Thus, the efflux of (most constituents of) semen is not possible. It is a cause of male infertility and / or pelvic pain. Ejaculatory duct obstruction must not be confused with an obstruction of the vas deferens. ==Prevalence, etiology and symptoms== If both ejaculatory ducts are completely obstructed, affected men will demonstrate male infertility due to aspermia/azoospermia. They will suffer from a very low volume of semen which lacks the gel-like fluid of the seminal vesicles or from no semen at all while they are able to have the sensation of an orgasm during which they will have involuntary contractions of the pelvic musculature. This is contrary to some other forms of anejaculation. Ejaculatory duct obstruction is the underlying cause for 1–5% of male infertility. In addition, it is reported to be a cause for pelvic pain, especially shortly after ejaculation. In case of proven fertility but unresolved pelvic pain, even one or both partially obstructed ejaculatory ducts may be the origin of pelvic pain and oligospermia. Ejaculatory duct obstruction may result in a complete lack of semen (aspermia) or a very low-volume semen (oligospermia) which may contain only the secretion of accessory prostate glands downstream to the orifice of the ejaculatory ducts. In addition to the congenital form which is often caused by cysts of the müllerian duct the obstruction can be acquired due to an inflammation caused by chlamydia, prostatitis, tuberculosis of the prostate and other pathogens. In Addition, calculus (medicine) was reported to mechanically block the ejaculatory duct, leading to infertility. However, in many patients, there is no history of an inflammation and the underlying cause simply remains unknown. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ejaculatory duct obstruction」の詳細全文を読む スポンサード リンク
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